// 语音相关工具函数 - 占位符实现

/**
 * 文本转语音 - 占位符实现
 * @param {string} text 要转换的文本
 * @param {Object} options 配置选项
 * @returns {Promise<Object>} 返回音频数据
 */
export async function textToSpeech(text, options = {}) {
  console.log('语音合成功能暂未实现，文本内容:', text)
  
  // 返回占位符数据
  return {
    success: false,
    message: '语音合成功能暂未实现',
    audioUrl: null,
    duration: 0
  }
}

/**
 * 语音转文本 - 占位符实现
 * @param {Blob} audioBlob 音频文件
 * @param {Object} options 配置选项
 * @returns {Promise<Object>} 返回识别结果
 */
export async function speechToText(audioBlob, options = {}) {
  console.log('语音识别功能暂未实现，音频大小:', audioBlob.size)
  
  // 返回占位符数据
  return {
    success: false,
    message: '语音识别功能暂未实现',
    text: '',
    confidence: 0
  }
}

/**
 * 播放音频 - 使用浏览器原生API
 * @param {string} audioUrl 音频URL
 * @param {Object} options 配置选项
 * @returns {Promise<Object>} 播放控制对象
 */
export async function playAudio(audioUrl, options = {}) {
  if (!audioUrl) {
    console.warn('音频URL为空')
    return { success: false, message: '音频URL为空' }
  }

  try {
    const audio = new Audio(audioUrl)
    
    // 设置音频属性
    if (options.volume !== undefined) {
      audio.volume = options.volume
    }
    
    if (options.loop) {
      audio.loop = true
    }

    // 播放音频
    await audio.play()
    
    return {
      success: true,
      audio: audio,
      stop: () => {
        audio.pause()
        audio.currentTime = 0
      },
      pause: () => audio.pause(),
      resume: () => audio.play()
    }
  } catch (error) {
    console.error('音频播放失败:', error)
    return {
      success: false,
      message: '音频播放失败: ' + error.message
    }
  }
}

/**
 * 停止所有音频播放
 */
export function stopAllAudio() {
  // 停止所有正在播放的音频元素
  const audioElements = document.querySelectorAll('audio')
  audioElements.forEach(audio => {
    audio.pause()
    audio.currentTime = 0
  })
  
  console.log('已停止所有音频播放')
}

/**
 * 检查浏览器是否支持语音功能
 * @returns {Object} 支持情况
 */
export function checkVoiceSupport() {
  const support = {
    speechSynthesis: 'speechSynthesis' in window,
    speechRecognition: 'webkitSpeechRecognition' in window || 'SpeechRecognition' in window,
    audioContext: 'AudioContext' in window || 'webkitAudioContext' in window,
    mediaDevices: 'mediaDevices' in navigator && 'getUserMedia' in navigator.mediaDevices
  }
  
  return {
    ...support,
    hasAnySupport: Object.values(support).some(Boolean)
  }
}

/**
 * 使用浏览器原生语音合成
 * @param {string} text 要合成的文本
 * @param {Object} options 配置选项
 * @returns {Promise<Object>} 合成结果
 */
export async function nativeTextToSpeech(text, options = {}) {
  if (!('speechSynthesis' in window)) {
    return {
      success: false,
      message: '浏览器不支持语音合成功能'
    }
  }

  return new Promise((resolve) => {
    const utterance = new SpeechSynthesisUtterance(text)
    
    // 设置语音参数
    if (options.rate) utterance.rate = options.rate
    if (options.pitch) utterance.pitch = options.pitch
    if (options.volume) utterance.volume = options.volume
    if (options.voice) utterance.voice = options.voice
    
    utterance.onend = () => {
      resolve({
        success: true,
        message: '语音合成完成'
      })
    }
    
    utterance.onerror = (event) => {
      resolve({
        success: false,
        message: '语音合成失败: ' + event.error
      })
    }
    
    speechSynthesis.speak(utterance)
  })
}

/**
 * 使用浏览器原生语音识别
 * @param {Object} options 配置选项
 * @returns {Promise<Object>} 识别结果
 */
export async function nativeSpeechToText(options = {}) {
  const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition
  
  if (!SpeechRecognition) {
    return {
      success: false,
      message: '浏览器不支持语音识别功能'
    }
  }

  return new Promise((resolve) => {
    const recognition = new SpeechRecognition()
    
    // 设置识别参数
    recognition.continuous = options.continuous || false
    recognition.interimResults = options.interimResults || false
    recognition.lang = options.lang || 'zh-CN'
    
    let finalTranscript = ''
    
    recognition.onresult = (event) => {
      for (let i = event.resultIndex; i < event.results.length; i++) {
        if (event.results[i].isFinal) {
          finalTranscript += event.results[i][0].transcript
        }
      }
    }
    
    recognition.onend = () => {
      resolve({
        success: true,
        text: finalTranscript,
        message: '语音识别完成'
      })
    }
    
    recognition.onerror = (event) => {
      resolve({
        success: false,
        message: '语音识别失败: ' + event.error
      })
    }
    
    recognition.start()
  })
}
